The temperature dependence of hopping conductivity and thermopower is found, with attention given to interaction between electrons arriving at the same center. It is shown that treatment of repulsive correlation leads to the appearance of Coulomb iterations in the apparent density of states figuring in the conductivity and thermopower. In the case of attraction, exponential temperature dependences are to be expected for the magnetic susceptibility, EPR signal intensity, and conductivity across singly charged centers. A nonactivated process of direct hopping of pairs competing, in the low temperature range, with the conduction mechanism is discussed.
Department of Semiconductor Physics
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